Mayor Sevastopol said the Russian Black Sea Fleet headquarters on the Crimea peninsula was attacked by UAV and the air defense shot down it.
The drone (UAV) was shot down by air defense forces right above the fleet headquarters.
He added that there was no great damage or casualties, calling for residents of the city to calm down and stayed in the house for a few more hours.
The Ukrainian army has not commented on this development.
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This is not the first time the Black Sea Fleet headquarters have been attacked by UAV.
Razvozhayev then said the local authorities canceled all activities to celebrate the traditional day of the Russian Navy because of security concerns.
The Russian Black Sea Fleet is stationed at Crimea's Sevastopol port.
Since Russia merged Crimea in 2014, the peninsula has been strongly strengthened and is the main supply route for Russian forces in southern Ukraine.
Kiev did not take responsibility behind the explosions in Crimea.
Location of Crimea peninsula.
President Putin called Crimea the mecca of Russia, but the peninsula recently continuously inspired attacks that caused serious damage.
By the tactics of the raiding bridges on the Dnipro River, the Ukrainian army turned the Kherson city into a mouth -isolated mouth of the Russian force.